Microjoules to Calories Converter
Enter the energy in microjoules below to convert it to calories.
Convert Microjoules to Calories
Enter a value in microjoules (µJ) to convert to calories (cal).
Microjoule to Gram Calorie Conversion Table
Table showing various microjoule measurements converted to calories. Click any preset value or arrow to load it into the converter.
| Microjoules (µJ) | Calories (cal) |
|---|---|
| 1 µJ | 0.000000239 cal |
| 10 µJ | 0.00000239 cal |
| 100 µJ | 0.000023901 cal |
| 1,000 µJ | 0.000239006 cal |
| 10,000 µJ | 0.0023901 cal |
| 100,000 µJ | 0.0239006 cal |
| 1,000,000 µJ | 0.2390057 cal |
| 5,000,000 µJ | 1.1950287 cal |
| 10,000,000 µJ | 2.3900574 cal |
| 25,400,000 µJ | 6.0707457 cal |
How to Convert Microjoules to Calories
To convert microjoules to calories, multiply the energy by the following conversion ratio: 0.000000239 calories/microjoule.
Since one microjoule is equal to 0.000000239 calories, you can use this simple formula to convert:
The energy in calories is equal to the energy in microjoules multiplied by 0.000000239.
For example, here's how to convert 5 microjoules to calories using the formula above.
How Many Calories Are in a Microjoule?
There are 0.000000239 calories in a microjoule, which is why we use this value in the formula above.
Our microjoule to gram calorie calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Microjoules and calories are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Microjoule?
A microjoule is a unit of energy equal to 1/1,000,000 of a joule (0.000001 J). One-millionth of a Joule. [1]
The microjoule is classified as a metric and SI-compatible unit of energy. Microjoules can be abbreviated as µJ; for example, 1 microjoule can be written as 1 µJ.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the microjoule (µJ) a convenient decimal multiple of the joule (J).
In practice, microjoules (µJ) are widely used across fine-tolerance laboratory, analytical, and micro-scale energy measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Gram Calorie?
A gram calorie is a unit of energy equal to 4.184 joules (J), the base unit for energy. Thermochemical gram calorie defined as 4.184 Joules. [2]
The gram calorie is classified as a standard unit of energy. Calories can be abbreviated as cal; for example, 1 gram calorie can be written as 1 cal.
When working with calories (cal) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, calories (cal) are widely used across standard energy applications within international standard workflows, engineering documentation, and technical data sheets.
When converting energy between microjoules (µJ) and calories (cal), keep full floating-point precision (1 µJ = 0.000000239 cal; 1 cal = 4,184,000 µJ) during intermediate calculations and round only the final gram calorie figure to match your instrument tolerance.
More Microjoule & Gram Calorie Conversions
Need to calculate in the opposite direction? Use our calories to microjoules calculator to switch your starting unit immediately. You can also explore related tools such as converting calories to microjoules, converting joules to calories, or converting calories to joules.
Convert from Microjoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Microjoules (µJ) to Calories (cal)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Microjoule (µJ) & Gram Calorie (cal) (cal)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (µJ to cal)